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Most shower heads are 1/2" NPT female thread; unscrew the old one from the shower arm pipe, put some pipe dope and/or teflon tape (about 3-4 complete wraps of the pipe) on the male threads, screw on new shower head, and Bob's your uncle. Might want to run the shower for a few seconds after taking off old shower head and before new one is installed to flush out any crap that might clog your new shower head.